Within each species, stems and leaves usually have more caralpol than that of root tubers, enlarged and low lignified root tubers accumulate more catalpol than that of thin and high lignified ones.

• 在各物种内，地上部分梓醇含量通常高于地下部分，粗壮和木质化程度低的块根中高于纤细和木质化程度高的块根中。